Contributors remain responsible for AI-assisted work. Agent credit belongs in the PR body or an Assisted-By trailer, not Co-Authored-By. Use the GitHub GraphQL API's Commit.authors list to check co-authors as GitHub recognizes them, excluding the primary author. Reject known agent accounts and use name and email heuristics only for co-authors without a linked account. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>